Graphical user interface for a display screen or portion thereof



FIG. 1 is a front view of a graphical user interface for a display screen or portion thereof showing our new design; and,

FIG. 2 is a front view of a second embodiment thereof.

The iPod trademark in the upper left corner of the Figures is a registered trademark of Apple Inc. The Nike Plus trademark in the lower left corner of the Figures is a registered trademark of Nike, Inc. Trademarks are the property of their respective owners.

The broken line showing of the display screen or portion thereof is not part of the claimed design. 

The ornamental design for a graphical user interface for a display screen or portion thereof, as shown and described. 